arch/arm/plat-feroceon/mv_hal/voiceband/tdm/mvTdmAddrDec.c

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*******************************************************************************/

#include "mvCommon.h"
#include "mvOs.h"
#include "ctrlEnv/mvCtrlEnvSpec.h"
#include "voiceband/tdm/mvTdmRegs.h"

/* defines  */
#ifdef MV_DEBUG
#define DB(x)	x
#else
#define DB(x)
#endif

static MV_TARGET tdmAddrDecPrioTable[] = {
	SDRAM_CS0,
	SDRAM_CS1,
	SDRAM_CS2,
	SDRAM_CS3,
	PEX0_MEM,
	PEX0_IO,
	TBL_TERM
};

static MV_STATUS mvTdmWinRead(MV_U32 winNum, MV_UNIT_WIN_INFO *pDecWin);
static MV_STATUS mvTdmWinWrite(MV_U32 winNum, MV_UNIT_WIN_INFO *pDecWin);
static INLINE MV_VOID mvTdmWinEnable(int winNum, MV_BOOL enable);
static MV_STATUS tdmWinOverlapDetect(MV_U32 winNum, MV_ADDR_WIN *pAddrWin);

/*******************************************************************************
* mvTdmWinInit - Initialize TDM address decode windows
*
* DESCRIPTION:
*               This function initialize TDM window decode unit. It set the
*               default address decode
*               windows of the unit.
*
* INPUT:
*       None.
*
* OUTPUT:
*       None.
*
* RETURN:
*       MV_ERROR if setting fail.
*******************************************************************************/
MV_STATUS mvTdmWinInit(MV_UNIT_WIN_INFO *addrWinMap)
{
	MV_U32 winNum;
	MV_U32 winPrioIndex = 0;
	MV_UNIT_WIN_INFO *addrDecWin;

	/*Disable all windows */
	for (winNum = 0; winNum < TDM_MBUS_MAX_WIN; winNum++)
		mvTdmWinEnable(winNum, MV_FALSE);

	for (winNum = 0; ((tdmAddrDecPrioTable[winPrioIndex] != TBL_TERM) && (winNum < TDM_MBUS_MAX_WIN));) {
		addrDecWin = &addrWinMap[tdmAddrDecPrioTable[winPrioIndex]];

		if (addrDecWin->enable == MV_TRUE) {
			if (MV_OK != mvTdmWinWrite(winNum, addrDecWin)) {
				mvOsPrintf("mvTdmWinWrite: failed setting window(%d)\n", winNum);
				return MV_ERROR;
			}
			winNum++;
		}
		winPrioIndex++;
	}
	return MV_OK;
}

/*******************************************************************************
* mvTdmWinWrite - Set TDM target address window
*
* DESCRIPTION:
*       This function sets a peripheral target (e.g. SDRAM bank0, PCI_MEM0)
*       address window, also known as address decode window.
*       After setting this target window, the TDM will be able to access the
*       target within the address window.
*
* INPUT:
*       winNum      - TDM to target address decode window number.
*       pDecWin     - TDM target window data structure.
*
* OUTPUT:
*       None.
*
* RETURN:
*       MV_ERROR if address window overlapps with other address decode windows.
*       MV_BAD_PARAM if base address is invalid parameter or target is
*       unknown.
*
*******************************************************************************/
static MV_STATUS mvTdmWinWrite(MV_U32 winNum, MV_UNIT_WIN_INFO *pDecWin)
{
	MV_U32 ctrlReg = 0, baseReg = 0;
	MV_U32 size;

	/* Parameter checking   */
	if (winNum >= TDM_MBUS_MAX_WIN) {
		mvOsPrintf("mvTdmWinWrite: ERR. Invalid win num %d\n", winNum);
		return MV_BAD_PARAM;
	}

	/* Check if the requested window overlapps with current windows         */
	if (MV_TRUE == tdmWinOverlapDetect(winNum, &pDecWin->addrWin)) {
		mvOsPrintf("mvTdmWinWrite: ERR. Window %d overlap\n", winNum);
		return MV_ERROR;
	}

	/* check if address is aligned to the size */
	if (MV_IS_NOT_ALIGN(pDecWin->addrWin.baseLow, pDecWin->addrWin.size)) {
		mvOsPrintf("mvTdmWinWrite: Error setting TDM window %d"
			   "\nAddress 0x%08x is unaligned to size 0x%x.\n",
			   winNum, pDecWin->addrWin.baseLow, pDecWin->addrWin.size);
		return MV_ERROR;
	}

	size = (pDecWin->addrWin.size / MV_TDM_WIN_SIZE_ALIGN) - 1;

	/* for the safe side we disable the window before writing the new
	   values */
	mvTdmWinEnable(winNum, MV_FALSE);

	ctrlReg |= ((pDecWin->attrib << TDM_WIN_ATTRIB_OFFS) & TDM_WIN_ATTRIB_MASK);
	ctrlReg |= ((pDecWin->targetId << TDM_WIN_TARGET_OFFS) & TDM_WIN_TARGET_MASK);
	ctrlReg |= ((size << TDM_WIN_SIZE_OFFS) & TDM_WIN_SIZE_MASK);

	/* Update Base value  */
	baseReg = (pDecWin->addrWin.baseLow & TDM_BASE_MASK);

	/* Write to address base and control registers  */
	MV_REG_WRITE(TDM_WIN_BASE_REG(winNum), baseReg);
	MV_REG_WRITE(TDM_WIN_CTRL_REG(winNum), ctrlReg);

	/* Enable address decode target window  */
	if (pDecWin->enable == MV_TRUE)
		mvTdmWinEnable(winNum, MV_TRUE);

	return MV_OK;
}

/*******************************************************************************
* mvTdmWinRead - Read peripheral target address window.
*
* DESCRIPTION:
*               Read TDM peripheral target address window.
*
* INPUT:
*       winNum - TDM to target address decode window number.
*
* OUTPUT:
*       pDecWin - TDM target window data structure.
*
* RETURN:
*       MV_ERROR if register parameters are invalid.
*
*******************************************************************************/
static MV_STATUS mvTdmWinRead(MV_U32 winNum, MV_UNIT_WIN_INFO *pDecWin)
{

	MV_U32 ctrlReg, baseReg;
	MV_U32 size;

	/* Parameter checking   */
	if (winNum >= TDM_MBUS_MAX_WIN) {
		mvOsPrintf("mvTdmWinRead: ERR. Invalid winNum %d\n", winNum);
		return MV_NOT_SUPPORTED;
	}

	baseReg = MV_REG_READ(TDM_WIN_BASE_REG(winNum));
	ctrlReg = MV_REG_READ(TDM_WIN_CTRL_REG(winNum));

	/* Check if window is enabled   */
	if (ctrlReg & TDM_WIN_ENABLE_MASK) {
		pDecWin->enable = MV_TRUE;

		/* Extract window parameters from registers */
		pDecWin->targetId = (ctrlReg & TDM_WIN_TARGET_MASK) >> TDM_WIN_TARGET_OFFS;
		pDecWin->attrib = (ctrlReg & TDM_WIN_ATTRIB_MASK) >> TDM_WIN_ATTRIB_OFFS;

		size = (ctrlReg & TDM_WIN_SIZE_MASK) >> TDM_WIN_SIZE_OFFS;
		pDecWin->addrWin.size = (size + 1) * MV_TDM_WIN_SIZE_ALIGN;
		pDecWin->addrWin.baseLow = (baseReg & TDM_BASE_MASK);
		pDecWin->addrWin.baseHigh = 0;
	} else {
		pDecWin->enable = MV_FALSE;
	}

	return MV_OK;
}

/*******************************************************************************
* mvTdmWinEnable - Enable/disable a TDM to target address window
*
* DESCRIPTION:
*       This function enable/disable a TDM to target address window.
*       According to parameter 'enable' the routine will enable the
*       window, thus enabling TDM accesses.
*       Otherwise, the window will be disabled.
*
* INPUT:
*       winNum - TDM to target address decode window number.
*       enable - Enable/disable parameter.
*
* OUTPUT:
*       N/A
*
* RETURN:
*       MV_ERROR if decode window number was wrong or enabled window overlapps.
*
*******************************************************************************/
static INLINE MV_VOID mvTdmWinEnable(int winNum, MV_BOOL enable)
{
	if (enable == MV_TRUE)
		MV_REG_BIT_SET(TDM_WIN_CTRL_REG(winNum), TDM_WIN_ENABLE_MASK);
	else
		MV_REG_BIT_RESET(TDM_WIN_CTRL_REG(winNum), TDM_WIN_ENABLE_MASK);
}

/*******************************************************************************
* tdmWinOverlapDetect - Detect TDM address windows overlapping
*
* DESCRIPTION:
*       An unpredicted behaviour is expected in case TDM address decode
*       windows overlapps.
*       This function detects TDM address decode windows overlapping of a
*       specified window. The function does not check the window itself for
*       overlapping. The function also skipps disabled address decode windows.
*
* INPUT:
*       winNum      - address decode window number.
*       pDecWin     - An address decode window struct.
*
* OUTPUT:
*       None.
*
* RETURN:
*       MV_TRUE if the given address window overlap current address
*       decode map, MV_FALSE otherwise, MV_ERROR if reading invalid data
*       from registers.
*
*******************************************************************************/
static MV_STATUS tdmWinOverlapDetect(MV_U32 winNum, MV_ADDR_WIN *pAddrWin)
{
	MV_U32 winNumIndex;
	MV_UNIT_WIN_INFO addrDecWin;

	for (winNumIndex = 0; winNumIndex < TDM_MBUS_MAX_WIN; winNumIndex++) {
		/* Do not check window itself       */
		if (winNumIndex == winNum)
			continue;

		/* Get window parameters    */
		if (MV_OK != mvTdmWinRead(winNumIndex, &addrDecWin)) {
			mvOsPrintf("%s: ERR. TargetWinGet failed\n", __func__);
			return MV_ERROR;
		}

		/* Do not check disabled windows    */
		if (addrDecWin.enable == MV_FALSE)
			continue;

		if (MV_TRUE == mvWinOverlapTest(pAddrWin, &(addrDecWin.addrWin)))
			return MV_TRUE;
	}

	return MV_FALSE;
}